change the buttons of a dialog

Hi
these questions refer to the Series 60 ...
Thanks in advance

1) how do I put my own buttons ( for example "button1" and "Cancel"😉 in the menu of a dialog .
how do I change the "Ok" and "Cancel" to my own options ? please show me some code if possible ...

2) why is the prompt of an Edwin Black (just black , nothing written) ???
I use this code in the RSS :

   DLG_LINE
   {
      type=EEikCtEdwin;
      prompt="Other :";
      id=EMyAppControlIdOther;
      control=EDWIN {width=25; maxlength=256;};
   }